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AQA A LEVEL Chemistry Exam Questions And Correct Answers

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  • AQA A Level Chemistry
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  • AQA A Level Chemistry

AQA A LEVEL Chemistry Exam Questions And Correct Answers Relative atomic mass - answerThe average mass of an atom of an element, relative to 1/12th of the mass of an atom of Carbon-12 Relative molecular mass - answerAverage mass of a molecule compared to 1/12th of the mass of a carbon-12 atom ...

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  • August 27, 2024
  • 8
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • AQA A Level Chemistry
  • AQA A Level Chemistry
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Thebright
©THEBRIGHT EXAM STUDY SOLUTIONS 8/26/2024 11:32 AM



AQA A LEVEL Chemistry Exam Questions
And Correct Answers


Relative atomic mass - answer✔✔The average mass of an atom of an element, relative to 1/12th
of the mass of an atom of Carbon-12

Relative molecular mass - answer✔✔Average mass of a molecule compared to 1/12th of the
mass of a carbon-12 atom

The Avogradro constant - answer✔✔the number of particles in a mole

ideal gas equation - answer✔✔pV = nRT

empirical formula - answer✔✔the simplest whole number ratio of atoms of each element in a
compound

percentage atom economy - answer✔✔(Mass of desired product/total mass of reactants) x 100

ionic bonding - answer✔✔the electrostatic attraction between oppositely charged ions in a lattice

covalent bond - answer✔✔a shared pair of electrons between non-metal elements

co-ordinate bond - answer✔✔a shared pair of electrons where both electrons are supplied by one
atom

repulsion in shapes of molecules - answer✔✔Lone pair-lone pair > lone pair-bonding pair >
bonding pair-bonding pair

electronegativity - answer✔✔the power of an atom to attract the pair of electrons in a covalent
bond

hess' law - answer✔✔Total enthalpy change for a reaction is independent of the route chosen

mean bond enthalpy - answer✔✔The energy required to break a covalent bond into gaseous
atoms averaged over different molecules


Bonds broken - bonds made

, ©THEBRIGHT EXAM STUDY SOLUTIONS 8/26/2024 11:32 AM


activation energy - answer✔✔The minimum amount of energy needed to start a chemical
reaction

catalyst - answer✔✔A substance that increases the rate of a chemical reaction without being
changed by providing an alternative reaction pathway by lowering activation energy

Le Chatelier's principle - answer✔✔When a system in dynamic equilibrium is subjected to
change, the position of equilibrium will shift to oppose the change.

oxidising agents - answer✔✔electron acceptors

reducing agents - answer✔✔electron donors

Enthalpy of formation - answer✔✔Enthalpy change when one mole of a compound is formed
from its constituent elements under standard conditions in their standard states

Enthalpy of atomization - answer✔✔The energy required to produce one mole of gaseous atoms
from an element in its standard state

Electron affinity - answer✔✔the enthaply change when one mole of gaseous atoms forms one
mole of -1 ions

Lattice enthalpy of formation - answer✔✔Enthalpy change when one mole of a solid ionic
compound is formed from its constituent ions in the gas phase

Lattice enthalpy of dissociation - answer✔✔Energy change when 1 mol of an ionic lattice
dissociates to its gaseous ions.

standard electrode potential - answer✔✔298K
100kPa
1.00moldm-3
Electrode reactions in lithium cell

(positive electrode) - answer✔✔Li+ + CoO2 + e- → Li+[CoO2]-
Electrode reactions in lithium cell

(negative electrode) - answer✔✔Li → Li+ + e-
Electrode reactions in hydrogen-oxygen fuel cell in acidic conditions

(positive electrode) - answer✔✔02 + 4H+ +4e- -> 2H20
Electrode reactions in hydrogen-oxygen fuel cell in acidic conditions

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